Attachments are dropped during the Webpurchasing or WebInvoicing approval process

When an approver in an approval rule logs into WebPortal to approve either a Requisition or a Web Invoice where a document was initially attached by the submitter, the attachment appears to have been dropped from the record when the approver opens the record. No error message occurs. This could be sporadic and does not happen every time. This can occur if the previous approver clicks Save or Finalize very quickly after approving, but before the system catches up to display the 1 attachment. The previous approver may be clicking finalize or save when the number of attachments displays a 0 before updating to show 1.